Malicious PDF — malware analysis report

Static analysis result for SHA-256 75db1ccca13cb054…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 22:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc9cb83536cc6219db797ac0908bec0f SHA-1: 382a4e9c78be0721ea9739584c4a0e4d84b95141 SHA-256: 75db1ccca13cb0549abc754c31d665076266c55c8d9c48bfc4038043f1118358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of multiple compromised CMS upload links further suggests an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=lego+8865+pdf PDF link annotation
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/a7b40hj1c5dd4d93g71islj5qs/wawivigiluxenijikodik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/02020714116.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/pinugefonaleme.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1649a0d23b---50590567031.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa969ef6c1---90292718195.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/17474068456.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/st343f40lhntucivoutk6huf30/duvebo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8fcfd99ee85015907f576cf3a0525583/45398361720.pdfIn PDF document text
    • http://asustainable.com/global/file/jekudeduruxusomuxexujav.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/2170486113.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/sovuxogumejegud.pdfIn PDF document text
    • https://aashianarealty.com/file/fexikazep.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98052f18e1f957ad5999262bc7f3b546/gixum.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68210db84---19893347604.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/44379438408.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/563f05c7510779294290ed69e448187a/65112108550.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/vejota.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ruik17be9f1ethaah3uifghik3/zovejovofalipagafowexune.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xejadefuba.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zaxevituxoxowot.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/galepelaguzo.pdfIn PDF document text
    • https://bamor.org/userfiles/file/63581259853.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/74b52af9af6c7f0c711aced95aea6c1b/51395405148.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b82cd8e25---kubevigixudapewu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 21976 bytes
SHA-256: b81713fdfc0fe64a56e96c6d135a9314f0ecb59ff1086848188252a372f83c40
font_01_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 10372 bytes
SHA-256: 5a83d179aec8053e0577520e1a3d8fd29c343e592fe6d515901dd9f76bb99809

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